Strip-straightening attachment for rotary shears



ov. 17 [561.803 N 1925 H. c. SMITH y STRIP STRAIGHTENING ATTACHMENT FORROTARY SHBARS Filed Dec. 7, 1921 2 shans-Sheet 1 INVENTOR. c. M

nnnm

ATTORNEY.

H. C. SMITH &TRIP STRIGHTENING ATTAHIENT FOR ROTARY SHEARS Nov. 17,1925.

Filed Dec. 7; 1921 2 Sheets-Sheet 2 Q INVENTOR.

x ATTORNEY.

Patented Nov. 17, 1925.

PATENT OEFICE;

HENRY'COLLIER SMITH, OF' ST. IVIARYS; OHIO STRIP.-STRAIGHTENINGATTACHMENT FOB' ROTARY SH'EARS:

Application. filedDecember?, 1921. Serial NO. 520.541)

Be it known that-I, H nNRY CoLLIER SMITH, a citizen of the United:States, and residing at St. li iarys, i in the County" of Au glaize andState of Ohio; have nvented a new and Ihproved Strip-Straightenng;At--

tachment for Rotary Shears; of which :the

following is a specification;

lChis invention relates straightening and flattening strips-cutfrom'sheets by rotaryshearsr or Cuttet's;` and its object is to=provde=asimple and easily ad justedmechanism which can-be readily: at-' tachedto or deta'ehed-from:the: frameof the-2 shears. i r

This invention consists of a pairof ;roll-- ers attached torotaryentters for: the purpose of lengthening-the outer edge'` of thestrip beingsevered from' a sheet ithe inner edge of the sheet* beingstretched by means of the cutters inmakingjthe cntand for the furtherpurpose of feeding the rear end of the strip entirely through thecutters.

lt 'further consists in` a pair of 'rollers adapted to engagethe-severed-strip and twist it contrary to the eurl` impartedstoitduring the shearingoperation in: order `to remove the cnrl and thusflatten.t-he--strip.-

It' also consists inadjustable mountings for thestraightening rollers toprovide for varatons n the amount of curl: in thes strips as they leavethe: eutters It also consistsin 'anadjustable guide :for one edge of thesheetbeing slitted and of the severed strip in order to straighten the'strip edgewise and to: properly` position it between the twisted rolls.-

It also consists' in the deta1'ls--o-f=construc-- tionillustrated inthecaecomp any ing' drawings and particularly` pointed out: in: the

claims.

In the drawings, Figy lisa sideelevationr of a rotary shear providedwith my nove] stral'ghtening. meehanismi F lg 2. isa front 7-7 of Fig.6.. Fig; 8 is aplan'ofa guide tor'severed strips:

Similar referencecharacters refer to like parts. throughout" the severalViews;

Therotary. shear shown in Fig. 1 is of well known design and isequippedwith roto means for tary cuttersl and 2 of substantally the same size,mounted on' the substantially' parallelshafts &and 4 respeetivelywhicheX-- tend in opposite directions The sheet 5'to' be slittedispassedbetweenthese Glitters-'and a strip 6 is'severed therefrom in theusual': manner. In Fig. 4 these cutters are shown 111 operativepositonend the' npper conical cutter 1 is shown provided with a-conicalextension? while'a eonieal rol'1 8 is m'ounte-d on the-hub 9 ofthe-eonieal cntter 2.' Rotary Glitters-;ofthis character are nsually made with th ir cutting. edges` of'the i same* diameter' in order toreduce frietion andz' heat ing. The feed 170118 isthereforerlarger thanthe roll 7. A spaeingtwasher 10 ofhard v ta'y cutters froni any ductilematerial; the 9 inner edge thereof is stret'ehedand:bent by the shearingprocess, causing the strip 'to become eurved edgewise and' helical inshape: This may beinpart' obviated: by the feed r lls 7'and 8whichengage the'outer edge of the severed stripandi may stretch it tosome extent. In all rotary shears, the; line of shear isseldom at` theplanepassin'g through the axes of the cutters, but is usu-..

ally at one side of this plane the distance depending on the lap of thecntters andthe:

thiclnessof thesheetbeing sheared.: Dni ing the outtng, the sheet is fedalongsby the cutters, but when a strip is severed, the

'strip and sheet stop; In the presentbase the rolls 7 and 8 force the'severed strip along beyond 'this common' plane ofthe cutters.

The curve or twist is not usually removed or prevented by the' rolls v7and 8' and straightening rollers are therefore provided. Brac kets 12and 13 are secured to the ;traine 14 of the'shear and a bar 15 iscarried thereby. A supporting plate ,16 is adjustably' mcnnted on` thisbar and'a 'uidebar is carried-by this plate. This guidebar is preferablyformed -of anupper member 17, a

lower memberl, a centralmember19"and I hearing platesQO, the lastpreferably of hard steel. Any desired means may be employedto unite theparts of this guide bar and the supporting plate. The lower member 18 ofthis guide bar extends forward on the feed side of the cutters andsupports [ne sneet being slitted up to the rotary cutters the edge ofthe sheet being guided by an adjacent plate 20. Beyond the cutters thismember 18 is preferably flush With the bottom edge of the plate 20.

Mounted on the guide bar is a base 22 which has a small boss 23 whichcarries a pin 24 on which a lover 25 is mounted. This lever carries apin 26 at its inner end on which the twisting or straightening roller 27is mounted and a pin 28 is journaled in its outer end. A bracket 29 onthis -base22 carries a screw 30 which turns in the threaded real' end 31of this pin 28. By turning the screw 30, the roller 27 is moved up ordown.

A plate 32 is attached to the frame 14 and a bar 33 is slidable in adove-*rail groove 34 therein. An arm 35 carries a screw 36 by means ofwhich this bar is supported. The upper end of this bar carries a pin 37on which is mounted the lower twisting oi' straightening roller 38 whichco-acts with the roller 27 to untwist the strips as they are severedfrom the sheet l-eunted on this pin 37 is a head 39 which has an arm 40which has an eye 42 at its enter end in. which the stem 43 is slidable.A wing niit 44 holds this arm against the spring 45 and an eye 46 at theinner end of this stem is mounted on the pin 47 carried by the bar It isevident that the members 27 and 38 are not necessarily rotatable, asthey would accomplish the same purpose if they were rigid, but thefriction is greatly reduced by having them irotatable. Neither is itnecessary for these rollers to have beveled faces.

Mounted on the head 39 is a guide plate 48 which has a beveled edgetoward the cutter- 2 and which can be tipped down to receive the severedstrip as it leaves the cutting rolls, this plate having a notch 49 toadmit the roller 38. By properly positioning this guide plate and thetwo rollers 27 and 37, any twists in the severed strips may he entirelyeliminated.

The strip as it leaves the cutters and the twisting rollers may have apermanent curve edgewise which may be removed by means of a roller 51extending through the guide plate 20 and earried by a pin 52 in a slidebloch 53 mounted in the bracket 54, as shown in Fig. 8. A screw 55mounted in this bracket is connected t-o the block 53 by means of smallclips 56, if desired. The roller 51 being adjustable in and out pushesthe strip 6 in to a greater or less extent and hends it in its own planeto straighten it. This member 51 may again be non-rotatable, hut in suchcase the friction would be gi'eater.

The operation of the st raightening meehanisin is apparent froni theforegoing description. By this Construction sheets or strips of anydesired material and of any size may be passed through between thecutters and slitted to produce fiat and straight strips of even width.This is par ticularly valuable when long ribbons of duetile metal are tobe slitted into narrower ribbons. It is apparent that this sheet guideand strip straightening attachment may be used with any other type ofrotary shear and may be adapted to such other types by skilledengineers.

The details and proportions of the several parts of this straighteningmechanism may all be changed by those skilled in the art withoutdeparting from the spirit of my invention as set forth in the followingclaims.

I claim 1. In combination with a shear provided with a pair of conicalrotary cutters, and conical rolls co-axial with said cutters to gripsevered strips between them.

2. In combination with a shear provided with a pair of conical rotarycutters, and conical rolls co-arial with said cutters to grip severedstrips between them, one of the rolls being -of greater diameter thanthe other.

3. In combination with a rotary shear provided with substantiallyparallel shafts extending in opposite directions and conical rotarycutters on the adjacent ends thei-cof` and conical feed rolls co-aXialwith said cutters to grip severed strips between them, one of the rollsbeing at the enter end of ene cutter and the other at the inner end ofthe other cutter.

4. In combination with a shear provided with a pair of rotary cuttersand shafts therefor a pair of straightening rollers having beveled facesadapted to engage and twist severed strips as they leave the cutters andparallel shafts for said straightening rollers.

5. In combinati on with a shear provided with a pair of rotary cutters,a pair of straightening rollers adapted to engage severed strips afterthey leave the cutte's, parallel shafts on which the rollers aremounted, the faces of the'rollers being heveled and adapted to twist thestrips; and means to adjust the rollers relative to each other.

6. In combination with a shear having rotary cutters, a guide plate t-oreceive severed strips, and a pair of straightening rellers adapted toengage the strips as they leave the guide plate and twist them the axesof the straightening rollers being at an angli to the aXes of the rotarycutters.

7. In combination with a shear having rotary cutters, a guide. barextending at right angles to the aXes of the cutters and adapted tosupport and guide a sheet 'to the cutters a pair of feed rolls adaptedto engage the strips as they are severed by the cutters and a pair ofstraightening rollers adapted to twist the severed strips. i

8. In combination with a shear having rot-ary cutters, a guide barextending at right angles to the axes of the cutters, and adapted tosupport and guide a sheet to the cutters, a pair of feed rolls adaptedto engage the strips as they are severed by the cutters, a pair ofstraightening rollers adapted to twist the severed strips, and anadjustable guide plaate for the strips between the feed rolls andstraightening rollers 9. In combination with ;a shear having rotarycutters, a pivotally mounted plate adapted to receive the severed stripsfrom the cutters, means to 'swing the plate, a pair of straighteningrollers adapted to engage the stripsas they leave said plate to twistthem, and means to move the guide plate toward and from one of saidrollers.

10. In combination with a shear having rotary cutters, a pivotallymounted plate adapted to receive the severed strips from the cutters,means to swing the plate, a pair of straightening rollers adapted toengage the strips as they leave said plate to twist them, and means tomove the guide plate toward and from one of said rollers, said platebeing pivo'ted on the aXis of the lower straightening roller.

11. In combination with a shear having rotary cutters, a pivotallymounted plate adapted to receive the severed strips from the cutters,means to swing the plate, a pair of straightening rollers adapted toengage the strips as they leave said plate to twist them, means to movethe guide plate toward and from one of said rollers, a support for theother roller, and means to move the upper roller toward and from theguide plate.

12. In combination with a shear having rotary cutters, a pivo'tallymounted plate adapted to receive the severed strips from the cutters,means to swing the plate, a pair of straightening rollers adapted toengage the strips as they leave said plate to twist them, means to movethe guide plate toward and from one of said rollers, a guide bar for thesheets from which the strips are to be severed, a lever mounted on theguide bar and having one of the straightening rollers mounted at oneend, and means 'to Swing said roller. r

13. In combination with a shear having rotary cutters, a guide barextending at right angles to the aXes of the cutters and adapted tosupport and guide a sheet to the cutters, a pair of feed rolls adaptedto engage the strips as they are severed by 'the cutters, a pair ofstraightening rollers adapted to twist the severed strips, and a guideroller adapted to engage the outer edges of the severed strips.

14. In combination with a shear having rotary cutters, a guide barextending at right angles to the aXes of the cutters and adapted tosupport and guide a sheet to the cutters, a pair of feed rolls adaptedto engage the strips as they are severed by the cutters, a pair ofstraightening rollers adapted to twist the severed strips, a guideroller adapted 'to engage the outer edges of the severed strips, andmeans to adjustably supportthe guide roller.

15. In combination with a shear having rotary cutters, the eombinationof a guide bar adapted to support and guide a sheet to be slt'ted, apair ofrolls co-aXial with the cutters adapted to feed severed stripsfrom the cutters, a guide plate adapted to receive the sev'ered strips,a. pivot on which the plate is mounted, means to move the pivot up anddown, means to Swing the plate on the pivot, a straightening rollermounted on 'said pivot, a lever mount'ed 011 the guide bar, a secondroller mounted on the lever oppo- 'site the first named roller means'toadjust the lever, the faces of the rollers being `beveled to twist thestrips, and a roller movable at right angles to the straighteningrollers adapted to engage one edge of 'the sever'ed strip to bend itedgewise.

16. In combination with a. shear provided with rotary cutters to slit asheet of metal and support it in a predetermined plane, a pair of rotarystraightening members having their aXes spaced apart from the aXes ofthe cutters and adapted to engage 'severed strips in a different planefrom that of 'the sheet as said strips leave the cutters.

17 In combination with a shear provided with rotary cutters to slit asheet of metal and support it in a predetermined plane, a pair of rotarystraightening members having their axes spaced apart from the aXes ofthe cutters and adapted to engage severed strips in a different planefrom that of the sheet as said strips leave the cutters and means toadjust said straightening member relative to said first named plane.

18. In eombination with a shear having rotary cutters adapted to producestrips of metal, and an adjus'table member spaced a distance from thecutters adapted to engage two edges of each of the severed strips tostraighten them.

19. In a metal cutting shear, the combination of ro'tary cutters forslitting sheets into strips, means to guide the sheets along straightlines and curl removing means operated by the cutters through the mediumof the strips which are being cut.

20. A metal cutting shear having rotary cutters for slitting sheets intostrips, means to guide the sheets along straight lines and curl removingmeans and strip straightening means operated by 'the cutters through themedium of the strip which is being flattened and straightened.

HENRY COLLIER SMITH.

